Seriously, Showtime indicates the removal date in a prominent way. And I do think Netflix used to, if they are the ones who had the UK Sherlock show. But I looked today to find removal dates for anything on Netflix but couldn't find any anywhere. Maybe I'm looking in the wrong place?
I barely watch anything current anymore, so they have to provide adequate time, especially for a series. (Obviously, Transformers is not a series.) It took me over a year to watch Smallville on Hulu, and months later it's still there.
Anyway, I already acquired the flick via "alternate means." Convenience alone is why I didn't simply do that in the first place.